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Search: Posts Made By: MechEngr
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28th Sep 2022, 22:31
Replies: 10,040
Views: 7,904,795
Posted By MechEngr

There are self-propelled devices for inspecting...

There are self-propelled devices for inspecting pipelines. As I recall they even managed to put one in a Bond film. Building a cart isn't tough.
26th Sep 2022, 13:49
Replies: 254
Views: 80,402
Posted By MechEngr

I think a solution is to add using a hash of the...

I think a solution is to add using a hash of the number. A simple one is to convert to base-26 with A=0, Z=25 for which 1011 => BMX and 1001 => BMN so the callout would be the pressure value followed...
21st Sep 2022, 17:01
Replies: 733
Views: 336,092
Posted By MechEngr

This is nearly identical to the solution that the...

This is nearly identical to the solution that the Speed Trim System (STS) provides with no notable problems. The first crew to encounter the adverse behavior commented that they thought STS was...
21st Sep 2022, 16:47
Replies: 733
Views: 336,092
Posted By MechEngr

It would be a confidence builder if that included...

It would be a confidence builder if that included a drag-polar comparison to show the amount of fuel penalty and, of course, the reason for the investigation, the Cm vs Alpha chart. Edit: that Cm vs...
16th Sep 2022, 01:53
Replies: 18
Views: 6,866
Posted By MechEngr

No one checking that filing? "The USAF set the...

No one checking that filing?
"The USAF set the DRS’s system reliability requirement at 0.999%"
I would hope that percent symbol is a typo.

It's really unclear from the indicated events what the...
2nd Sep 2022, 03:18
Replies: 14
Views: 3,509
Posted By MechEngr

My wife was an item manger for the Army and...

My wife was an item manger for the Army and supported helicopters. Very creative ways they proposed she send them equipment they were not authorized to have or should have had on hand. They'd send in...
2nd Sep 2022, 00:09
Replies: 51
Views: 1,772
Posted By MechEngr

That one doesn't have the redirect prefix in the...

That one doesn't have the redirect prefix in the URL - oh, it looks like the automatic prefix of "redirect" has been removed.
1st Sep 2022, 23:02
Replies: 51
Views: 1,772
Posted By MechEngr

Invisible URLs and in-line content have been...

Invisible URLs and in-line content have been going for months; the broken links is new.
1st Sep 2022, 20:16
Replies: 51
Views: 1,772
Posted By MechEngr

I use NoScript, with pprune.org the only one...

I use NoScript, with pprune.org the only one running scripts. This change in behavior is new; I presume something has changed - does it use a cookie provider or other script?
31st Aug 2022, 00:52
Replies: 4
Views: 1,332
Posted By MechEngr

The original article:...

The original article: https://www.thedrive.com/the-war-zone/video-of-mysterious-drone-swarm-over-navys-most-advanced-destroyer-released



Odd that they had an accurate track while the drones...
Forum: Rotorheads
25th Aug 2022, 14:48
Replies: 19
Views: 3,127
Posted By MechEngr

Data storage is cheap and most power lines aren't...

Data storage is cheap and most power lines aren't going anywhere - they are thin enough that one could approximate them as points where the towers are and line segments between the points; for...
22nd Aug 2022, 14:43
Replies: 43
Views: 7,276
Posted By MechEngr

Just a reminder that the electronics to make a...

Just a reminder that the electronics to make a warning system are about $100. A software defined radio to accept the ADSB transmission and a Raspberry Pi to interpret and some display and a warning...
Forum: Rotorheads
9th Aug 2022, 12:12
Replies: 11
Views: 1,968
Posted By MechEngr

'Tis true. From the mouth of a PhD structural...

'Tis true. From the mouth of a PhD structural engineer I worked with. The example - placing a glass onto a hard table.

The glass and table are both elastic - springy. So when the contact of the...
2nd Aug 2022, 13:08
Replies: 33
Views: 7,574
Posted By MechEngr

Hellfire Ninja - it has a 100 pound (or so) block...

Hellfire Ninja - it has a 100 pound (or so) block of metal and a bunch of actuated blades that pop out just before reaching the target to Ginsu knife whoever is standing in the immediate vicinity...
2nd Aug 2022, 05:46
Replies: 33
Views: 7,574
Posted By MechEngr

Converting this guy to hamburger means no one can...

Converting this guy to hamburger means no one can take hostages to try for an exchange and the hamburger isn't going to be issuing any coded messages to his followers. His human rights can no longer...
29th Jul 2022, 04:08
Replies: 15
Views: 1,923
Posted By MechEngr

https://www.youtube.com/watch?v=J_8mdH20qTQ

https://www.youtube.com/watch?v=J_8mdH20qTQ
Forum: Rotorheads
27th Jul 2022, 03:59
Replies: 171
Views: 51,759
Posted By MechEngr

There are persistence of vision (POV) video...

There are persistence of vision (POV) video displays that use a linear array of LEDs that light the entire circular path they take. It would be (technology wise) easy to add this to the rotor to...
Forum: Rotorheads
26th Jul 2022, 23:23
Replies: 171
Views: 51,759
Posted By MechEngr

There are shrouded fans/rotors which are serious...

There are shrouded fans/rotors which are serious structural items. A basic wire guard carries the risk of coming loose or becoming snagged and destroying the tail rotor in flight, which seems like a...
Forum: Tech Log
19th Jul 2022, 03:52
Replies: 45
Views: 3,393
Posted By MechEngr

No slap intended - just a couple of neurons...

No slap intended - just a couple of neurons waking up to recall the Fluid Dynamics class and recalling seeing dye flow tests on small scale models for supersonic designs operating at low speed and...
Forum: Tech Log
19th Jul 2022, 01:34
Replies: 45
Views: 3,393
Posted By MechEngr

Far higher Reynold's number for water at similar...

Far higher Reynold's number for water at similar speed; also, look at the relative areas for carrying the opposing forces.
Forum: Tech Log
17th Jul 2022, 18:36
Replies: 5
Views: 1,093
Posted By MechEngr

On descent the aircraft interior will start...

On descent the aircraft interior will start re-compression. If it doesn't then the fuselage can be crushed by outside air pressure. Your eardrums feel the same pressure change and should equalize via...
16th Jul 2022, 02:54
Replies: 27
Views: 2,653
Posted By MechEngr

see...

see https://www.flickr.com/photos/[email protected]/6813260102/
13th Jul 2022, 08:29
Replies: 4
Views: 467
Posted By MechEngr

From...

From https://www.openqm.com/openqm/what-is-multivalue/

Using a grocery receipt as an example:

In a relational database there would be a record for the particular sale: The transaction table...
5th Jul 2022, 22:58
Replies: 30
Views: 5,408
Posted By MechEngr

That's the Apple Airtag system. As long as...

That's the Apple Airtag system. As long as someone with an iPhone is nearby, the location of that phone and rough distance to the Airtag will get sent to you. Not enough to say exactly where it is,...
Forum: Tech Log
2nd Jul 2022, 16:02
Replies: 45
Views: 3,393
Posted By MechEngr

"The FAA teaches that the air wants to get from A...

"The FAA teaches that the air wants to get from A to B over the top, at the same time as the flow goes underneath from the same points. "


That would explain things, just not aerodynamic things....
Forum: Tech Log
14th Jun 2022, 18:19
Replies: 10
Views: 2,354
Posted By MechEngr

There was the incident at Lambert International a...

There was the incident at Lambert International a years ago where a little girl was killed during passenger boarding by running into the opposite side propeller on a commercial turboprop twin. She...
5th Jun 2022, 22:53
Replies: 108
Views: 8,585
Posted By MechEngr

ADS-B Out position messages are/ought to be...

ADS-B Out position messages are/ought to be transmitted once-per second, no interrogation required. I don't know about message collision avoidance in ADS-B, but I am aware that potential saturation...
5th Jun 2022, 07:49
Replies: 108
Views: 8,585
Posted By MechEngr

Something I did not see mentioned in the above is...

Something I did not see mentioned in the above is that ADSB Out doesn't have to originate with the aircraft. If there is primary radar coverage of an area the radar operator can broadcast an ADSB...
Forum: Tech Log
9th May 2022, 01:44
Replies: 11
Views: 1,664
Posted By MechEngr

Is there a different Kegworth 737 accident? The...

Is there a different Kegworth 737 accident? The one I see, from 1989, was that there was smoke in the cabin and they didn't understand a difference in air supply from earlier models and they shut...
Forum: Tech Log
6th May 2022, 23:20
Replies: 11
Views: 1,664
Posted By MechEngr

Training avoidance was not the fundamental cause...

Training avoidance was not the fundamental cause and neither was the lack of documentation. The first plane to encounter the problem landed safely after a 90 minute flight and they had neither...
26th Apr 2022, 19:46
Replies: 107
Views: 11,871
Posted By MechEngr

If that's true they are truly diabolical:...

If that's true they are truly diabolical: https://www.ag.gov.au/rights-and-protections/human-rights-and-anti-discrimination/human-rights-scrutiny/public-sector-guidance-sheets/presumption-innocence
...
26th Apr 2022, 15:22
Replies: 107
Views: 11,871
Posted By MechEngr

I did not find the word "belief" in that TSI...

I did not find the word "belief" in that TSI regulation.

In the US there is a standard approach called "void for vagueness" which means that a law or regulation cannot be decided by a typical...
25th Apr 2022, 14:24
Replies: 5
Views: 1,147
Posted By MechEngr

If you are looking at algebra, trigonometry,...

If you are looking at algebra, trigonometry, calculus, that sort of thing, look for the Khan Academy on line. It's free; if you sign up it will keep track of your progress. I did and can report no...
25th Apr 2022, 14:17
Replies: 107
Views: 11,871
Posted By MechEngr

Is there a link to the rule that would...

Is there a link to the rule that would require/allow prosecution of a pilot for exceeding Vne? Apparently in the US doing so will void the airworthiness certificate, but not sure why it would end up...
Forum: Tech Log
22nd Apr 2022, 01:59
Replies: 3
Views: 1,150
Posted By MechEngr

The primary hazard in battery fires is that they...

The primary hazard in battery fires is that they contain the oxidizer for their intended reaction so external smothering that might put out liquid or solid fuels doesn't work too well. The main...
Showing results 1 to 35 of 185
 


 
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